Yoshito Hirose (広瀬 義人 Hirose Yoshito) is Shiori's father, the one responsible for breaking the Undead's seal in a fit of madness, dying in the process. He created the Trial-series Undead Trial B (トライアルＢ Toraiaru Bī) in his image to protect Shiori, possessing all his creator's memories. However, Trial B was reprogrammed by Tennōji to continue to monitor the fixed Undead battle and remove potential threats before he sacrifices to protect Shiori from Trial G. Yoshito Hirose was portrayed by Jyunichi Haruta (春田 純一 Haruta Jun'ichi), who also portrayed Trial B.